Structural integrity and damage of ZrB2 ceramics after 4 MeV Au ions irradiation

Bao, Weichao; Robertson, Stuart; Zhao, Jiawei; Liu, Jixuan; Wu, Houzheng; Zhang, Guojun; Xu, Fangfang

doi:10.1016/j.jmst.2020.09.019

Cited by 18 publications

(5 citation statements)

References 38 publications

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“…Transition metal diboride has the potential to be used as plasma facing material for nuclear fusion reactors on the strength of its high melting point, high thermal conductivity, low sputtering yield, low hydrogen isotope retention, and excellent resistance to helium ions and neutron irradiation, etc. [230,231]. It can be expected that high-entropy boride ceramics would have good irradiation resistance.…”

Section: Nuclear Energymentioning

confidence: 99%

High-entropy ceramics: Present status, challenges, and a look forward

et al. 2021

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High-entropy ceramics (HECs) are solid solutions of inorganic compounds with one or more Wyckoff sites shared by equal or near-equal atomic ratios of multi-principal elements. Although in the infant stage, the emerging of this new family of materials has brought new opportunities for material design and property tailoring. Distinct from metals, the diversity in crystal structure and electronic structure of ceramics provides huge space for properties tuning through band structure engineering and phonon engineering. Aside from strengthening, hardening, and low thermal conductivity that have already been found in high-entropy alloys, new properties like colossal dielectric constant, super ionic conductivity, severe anisotropic thermal expansion coefficient, strong electromagnetic wave absorption, etc., have been discovered in HECs. As a response to the rapid development in this nascent field, this article gives a comprehensive review on the structure features, theoretical methods for stability and property prediction, processing routes, novel properties, and prospective applications of HECs. The challenges on processing, characterization, and property predictions are also emphasized. Finally, future directions for new material exploration, novel processing, fundamental understanding, in-depth characterization, and database assessments are given.

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Section: Nuclear Energymentioning

confidence: 99%

High-entropy ceramics: Present status, challenges, and a look forward

et al. 2021

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“…As a member of UHTCs, ZrB 2 has good irradiation resistance and relatively low density, which makes it more popular among other UHTCs 6–8 . In order to enhance the properties of ZrB 2 ceramics, many approaches have been investigated by researchers.…”

Section: Introductionmentioning

confidence: 99%

“…4,5 As a member of UHTCs, ZrB 2 has good irradiation resistance and relatively low density, which makes it more popular among other UHTCs. [6][7][8] In order to enhance the properties of ZrB 2 ceramics, many approaches have been investigated by researchers. Improving densification by adding sintering aids is the most common and effective approach to promoting the mechanical and thermal properties of ZrB 2 ceramics.…”

Section: Introductionmentioning

confidence: 99%

ZrB₂‐based solid solution ceramics and their mechanical and thermal properties

Bao

Shen

et al. 2022

Int J Applied Ceramic Tech

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Zirconium diboride ceramics as one of the main members of ultrahightemperature ceramics are capable of being used as structural components at ultrahigh temperatures. Entropy adjusting is a newly developed approach to improving the properties of ceramics. In this work, a series of ZrB 2 -based solid solution ceramics with different mixing entropies, formulated (Zr x Ti y Nb y Ta y )B 2 (x = .25, .85, .925, .9625, 1; x + 3y = 1), were prepared by adjusting the content of other diborides. Diboride solid solution powders were synthesized by boro/carbothermal reduction process and then densified by spark plasma sintering. The results show that the formation of a single-phase solid solution is independent of the mixing entropy in (Zr x Ti y Nb y Ta y )B 2 system. The addition of other diborides into ZrB 2 is beneficial to reduce the particle size of the synthesized powder and promote the densification process. The dense sintered samples with higher mixing entropy have finer grain size, higher hardness, and modulus. The (Zr 0.25 Ti 0.25 Nb 0.25 Ta 0.25 )B 2 ceramic has the highest hardness of 31 GPa and a modulus of 682 GPa. Severe lattice distortion in samples with higher mixing entropy will result in increased phonon scattering and lower thermal conductivity.

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“…[46] for our calculations of defect energetics following Refs. [57,58]), are shown to be more stable than other defects along with their reported occurrences in MB 2 [26,27,[58][59][60][61][62]. Defects change the local environment of charge distribution, mass density, chemical bonding, which are static properties but affect the forces seen by dynamic properties.…”

Section: Effect Of Vacanciesmentioning

confidence: 96%

Site-independent strong phonon-vacancy scattering in high-temperature ceramics ZrB2 and HfB2

Sonar

Dehankar²,

Vijayalakshmi³

et al. 2022

Phys. Rev. Materials

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Similar effects of metal and boron vacancies on phonon scattering and lattice thermal conductivity (κ l ) of ZrB 2 and HfB 2 are reported. These defects challenge the conventional understanding that associates larger impacts to bigger defects. We find the underlying reason to be a strong local perturbation caused by boron vacancy that substantially changes the interatomic force constants. In contrast, a long ranged but weaker perturbation is seen in the case of metal vacancy. We show that these behaviors originate from a mixed metallic and covalent bonding nature in the metal diborides. The thermal transport calculations are performed in a complete ab initio framework based on Boltzmann transport equation and density functional theory. Phonon-vacancy scattering is calculated using ab initio Green's function approach. Effects of natural isotopes and grain boundaries on κ l are also systematically investigated, however we find an influential role of vacancies to explain large variations seen in the experiments. We further report a two-order of magnitude difference between the amorphous and purecrystal limits. Our results outline significant material design aspects for these multifunctional high-temperature ceramics.

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Structural integrity and damage of ZrB2 ceramics after 4 MeV Au ions irradiation

Cited by 18 publications

References 38 publications

High-entropy ceramics: Present status, challenges, and a look forward

High-entropy ceramics: Present status, challenges, and a look forward

ZrB₂‐based solid solution ceramics and their mechanical and thermal properties

Site-independent strong phonon-vacancy scattering in high-temperature ceramics ZrB2 and HfB2

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Structural integrity and damage of ZrB2 ceramics after 4 MeV Au ions irradiation

Cited by 18 publications

References 38 publications

High-entropy ceramics: Present status, challenges, and a look forward

High-entropy ceramics: Present status, challenges, and a look forward

ZrB2‐based solid solution ceramics and their mechanical and thermal properties

Site-independent strong phonon-vacancy scattering in high-temperature ceramics ZrB2 and HfB2

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Product

Resources

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Structural integrity and damage of ZrB2 ceramics after 4 MeV Au ions irradiation

ZrB₂‐based solid solution ceramics and their mechanical and thermal properties